Spring manufacturing device

ABSTRACT

A spring manufacturing device includes an input shaft having a passage defined therethrough for a wire extending and a first gear is fixedly mounted to the input shaft and driven by a first servo motor. A second gear is freely mounted to the input shaft and driven by a second servo motor. A box having two pairs of rollers is connected between the input shaft and an output shaft and the wire is rolled forward by the rollers. A first auxiliary gear is co-axially is co-rotatably connected to the second gear and drives the rollers on the box. The auxiliary gear is driven by a third servo motor. The input shaft and the output shaft are rotated independently from the box.

FIELD OF THE INVENTION

[0001] The present invention generally relates to a spring manufacturing device that has a box co-rotatably connected to a shaft so that the wire is clamped whole the box is rotated.

BACKGROUND OF THE INVENTION

[0002] Conventional spring manufacturing device utilizes several pairs of rollers to send a wire and an end of the wire is sent to an operation section on which a lot of forming members are located. The end of the wire is then bent to a desired angle and the wire is then scrolled on a mandrel to form a coil spring. The other end of the wire is also be bent to have a desired angle. The operation section has many pairs of forming members so as to bend the wire to different angles. However, it is difficult to bend the wire to a small angle if the operation section has too many forming members thereon. An improved wire device has a rotary device which is cooperated with a computer to rotate the wire at a preprogrammed angle and one of the pairs of forming members are activated to bend the wire. By this way, a small angle on the wire can be done. Nevertheless, the rollers sending the wire have to release the wire when the wire is rotated. Similarly, when sending the wire by the rollers, the rotary device has to be stopped. This is not efficient for production. Besides, the wire could shift if no rollers retain the wire when the wire is rotated and the shift of the wire results an un-precise product.

SUMMARY OF THE INVENTION

[0003] This invention has been made to overcome the above mentioned drawbacks of a conventional spring manufacturing device and comprises an input shaft through which a wire extends and a first gear is fixedly mounted to the input shaft which is driven by a first servo motor. A second gear is freely mounted to the input shaft and driven by a second servo motor. A first auxiliary gear is co-axially and co-rotatably connected to the second gear. A box has an end thereof connected to an end of the input shaft and two first rollers and two second rollers are connected to the box. The other end of the box is connected to an output shaft and a third gear is co-axially connected to the output shaft. A fourth gear is engaged with the auxiliary gear and a driving shaft extends from the fourth gear and is inserted into the box. The driving shaft drives the two first rollers and the two second rollers. A third servo motor drives the third gear.

[0004] The primary object of this invention is to provide a spring manufacturing device wherein the wire is still controlled by the rollers while it is rotated.

[0005] The foregoing and other objects, features, aspects and advantages of the present invention will become better understood from a careful reading of a detailed description provided herein below with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006]FIG. 1 is a side view to show the spring manufacturing device of the present invention, wherein two pairs of rollers on the box are shown;

[0007]FIG. 2 is a side view to show the spring manufacturing device of the present invention, wherein a set of guide rollers are shown;

[0008]FIG. 3 is a side view to show the spring manufacturing device of the present invention, wherein three servo motors are shown;

[0009]FIG. 4 is an end view to show the connection of the auxiliary gear and the fourth gear of the spring manufacturing device of the present invention, and

[0010]FIG. 5 shows a plurality of bending devices connected to the output shaft of the spring manufacturing device of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0011] With reference to FIGS. 1 to 3, the spring manufacturing device of the present invention comprises a guide roller device 7 has a plurality of rollers 71 and an input shaft 4 is located at the output end of the guide roller device 7. The input shaft 4 has a passage 41 defined therethrough so that a wire 5 (FIG. 3) guided by the guide roller device 7 extends through the passage 41. A first gear 2 is fixedly mounted to the input shaft 4 which extends through a first board 9. A first servo motor 6 has a first motor gear 61 and a belt 62 is connected between the first motor gear 61 and the first gear 2. A second gear 3 is freely mounted to the input 3 shaft 4 and driven by a second servo motor 6A wherein the second servo motor 6A has a second motor gear 6A1 and a belt 6A2 is connected between the second motor gear 61 and the second gear 3. A first auxiliary gear 31 is co-axially and co-rotatably connected to the second gear 3.

[0012] A box 1 has an end thereof connected to an end of the input shaft 4 and has two first rollers 116, 116A and two second rollers 111, 111A. The wire 5 extends from the input shaft 4 contacts and passes between the two first rollers 116, 1116A and the two second rollers 111, 111A, and is sent to an output shaft 82. The other end of the box 1 connected to a bearing 84 which is mounted to the output shaft 82. A third gear 81 is co-axially connected to the output shaft 82 which extends through a second board 8.

[0013] Further referring to FIG. 4, a fourth gear 1151 is engaged with the auxiliary gear 31 and a driving shaft 1150 extends from the fourth gear 1151 and inserted into the box 1. The driving shaft 1150 drives the two first rollers 116, 116A and the two second rollers 111, 111A. The driving shaft 1150 is connected to a driving gear 115 which is a bevel gear in this embodiment and a mediate shaft 117 is located in the box 1 with a main gear 1141 mounted to the mediate shaft 117. A co-operated gear 114 which is a bevel gear, is connected to the main gear 1141 and engaged with the driving gear 115. Each of the first rollers 116, 116A and the two second rollers 111, 111A are mounted to a rod 11, 11A. Each rod has an operation gear 112, 113 which are engaged with the main gear 1141. Therefore, the rollers 116, 116A, 111, 111A move the wire forward when the second servo motor 6A is operated.

[0014] A third servo motor 6B has a third motor gear 6B1 which is connected to a gear 6B4 on a second shaft 6B3 by a belt 6B2. The second shaft 6B3 has a gear 6B5 on the other end thereof and the gear 6B5 is connected to the third gear 81 by a belt 6B6. On the other side of the second board 8, there are a plurality of bending devices 83 (shown in FIG. 5) which are used to bend the wire 5.

[0015] The box 1 are independently connected between the input shaft 4 and the output shaft 82 so that when the first servo motor 6 is activated, the input shaft 4 is rotated, while the box 1 is not co-rotated and the wire 5 is still guided by the first rollers 116, 116A and the two second rollers 111, 111A which are controlled by the second servo motor 6A. The output shaft 82 is rotated by activating the third servo-motor 6B and the output shaft 82 is rotated independently from the box 1.

[0016] The spring manufacturing device of the present invention provides a solution to overcome the shortcoming of the conventional spring manufacturing device by the independent rotation of the box 1.

[0017] Although the present invention has been described with reference to the preferred embodiments, it will be understood that the invention is not limited to the details described thereof. Various substitutions and modifications have been suggested in the foregoing description, and others will occur to those of ordinary skill in the art.

[0018] Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims. 

What is claimed is:
 1. A spring manufacturing device comprising: an input shaft having a passage defined therethrough and a first gear fixedly mounted to said input shaft, said first gear driven by a first servo motor, a second gear freely mounted to said input shaft and driven by a second servo motor, a first auxiliary gear co-axially and co-rotatably connected to said second gear; a box having an end thereof connected to an end of said input shaft and having two first rollers and two second rollers, the other end of said box connected to an output shaft and a third gear co-axially connected to said output shaft; a fourth gear engaged with said auxiliary gear and a driving shaft extending from said fourth gear and inserted into said box, said driving shaft driving said two first rollers and said two second rollers, and a third servo motor driving said third gear.
 2. The device claimed in claim 1, wherein said driving shaft is connected to a driving gear and a mediate shaft is located in said box with a main gear mounted to said mediate shaft, a co-operated gear connected to said main gear and engaged with said driving gear, each of said first rollers and said two second rollers mounted to a rod, each rod having an operation gear which are engaged with said main gear.
 3. The device as claimed in claim 2, wherein said main gear and said co-operated gear are bevel gears.
 4. The device as claimed in claim 1, wherein said first servo motor has a first motor gear and a belt is connected between said first motor gear and said first gear.
 5. The device as claimed in claim 1, wherein said second servo motor has a second motor gear and a belt is connected between said second motor gear and said second gear. 